Discussions By Condition: I cannot get a diagnosis.

Strange "THING" on my index finger

This THING appeared on my finger about a year ago, at first I did not pay attention to it, but with time it began bothering me.I went to a skin doctor and he couldn't tell me exactly what it was.He tried burning it with Nitrogen 4-5 times but it didn't help, since the core of this THING always survived even after the burned skin has come off.

The THING has a rough texture.

What scares me is that about a month ago, the THING started spreading, and it already grew in 50% in a month (!).

My everyday job includes meeting with people, and this THING on my hands is really bothering me, it's really non-aesthetic.

Can you help me diagnose what this is?I can provide photos in better resolution if required.